Hair fastener



FIG. 1 is a rear elevation of a hair fastener applied to the hair; and,

FIG. 2 is a perspective view of the hair fastener.

The broken lines showing the head and hair of a person in FIGS. 1 and 2 are for illustrative purposes only and do not form part of the claimed design. 

The ornamental design for a hair fastener, as shown and described. 